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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1e1eb5e2e092161fababf3c0f1ae34b97fdce4818be0e7cde2d11ed1968905' 
  AND token = 'xd6B3sSF4oXX8fownRLEyNIC8aWi0ZS3OpgiMfIUEU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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