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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5281eac8110b2adc617175de9d7bae4ade094ef01cdcf2a95fc0a00174ed4b3' 
  AND token = 'kh+VKfdSiXAY+ozydt7s859fvuc51Kjd9GkPCbADbGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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