SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c755c78b3473f0f8f1da646db585837e70be2cf27dd2386e470b13c5ff94ffc7' 
  AND token = '2xXV1HRnkmNQBoyRpxJmlfjVartyGXZ3GKIbCrP/4Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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