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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a02476764cf8ea97c12ffab2411ba006b5f0636a7af6accbee6d934bcc7f9f7' 
  AND token = 'f0cj4c0r4/IEQpUBwm8iYAyvU9aPQ1NY+fHoRDQHX0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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