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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a0c4c8a733543c48750fb5ee0a91e66d2e425ef250c76ae8b8a29197553a89' 
  AND token = 'TEdjJY7bqXLvrWcfgdwmpb1XgmPudb0EAtGiYghClho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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