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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af31c58c12298fafa354bdfe7f61d2b1f1a06fcd487474db1c56caf2f6d6b0d2' 
  AND token = '8m8X5BNQIp18Uj5DcQypjQttL2Pw5HGMLubSSBgFt9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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