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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f0de68a5b7851405ac925c1d7a6f13edc44bb9a1ef5448b649a5901178b56e' 
  AND token = '6CJH1ODis5L84FtI7VV6h2z77xKBeAxAW/rWNKseb8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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