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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cf588574d94bfd3167280518d285dbef4332c62cb817ae51feca34f303102c' 
  AND token = 'gifa5wSNmDT/00LJ+y19LEq8/3avHmGkW+yUwphBbM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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