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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda41092e327fa11702a35ff01495f6be00a92220c0f50d96401ca1dee1607f' 
  AND token = 'sJ0dGjJCCP3PvKvMk6IMa9YXRoNQTjfMoK+520i+XXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}