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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629793fd4277995a56b70eb721027bea64a3aa59f94768601be2f8df5601af3b' 
  AND token = 'auqB2ZSDQegxeUgO3X9aaVlzUP0IgR4HsfX/DH7UopU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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