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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e79f7bd70461c761dfeb81adb9e73cebdcd84325913e8f10f483107a93fac2' 
  AND token = 'WDsTUGtvlAlpSrn++08aPVi7Ya5h66K9DsAMC/Syltc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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