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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48113ffa1a40744b169a25a80a819dfd15a00725a16ad720be7a7a0b482d1b1' 
  AND token = 'viAegcojFxqaUa8maQla+adv62Hxs408j9wySuu3EMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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