SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05814965244e60ecbe8d48c90a4b911df4ffba0b2258e37654d575728bd3abc' 
  AND token = '9OauXHs9/YXUGKPwwaujuDF+oc2LXCTg6v90U/CDc78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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