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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b557df22359e4f24c6b0d6ae4b414fdda4062d41483fc0ce814d7573e6ef2c1' 
  AND token = 'uxxJUABFgNVuu5lK2saik+xCMDQPurwdgiDnVp+x+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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