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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b70c8066f7c97c657a59423e7339da858ff75d12d9741262298e9e74c3b66ab' 
  AND token = 'JfTnLLn068Z8R6llawxpFRMCaKK3TlUJCBDHEw5MXjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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