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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36f1363d2b788630ed473eded6cfb265336069f50e93ca2c9c7dbc964ab493d' 
  AND token = '3XO6AwdwWgo2gzKSYYjZx0yX8BcAV0lamSXDkQcbwCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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