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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fadad50bf58f3b8ccbdbc5a9ea4bccd7d62b348595928659f32c09c7935f55d' 
  AND token = '9+a0DovAcwdEZ48qk0+chA1Jsz2YkfPS15Nq0n+6uow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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