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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae616fb8bee06694328e704337f613c435af97381895f49c9af7c04555aef885' 
  AND token = 'uSr19ElopJK7BAIkSf5taWK0NhBgdFMT9NkjXtqp1Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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