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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a5698f41f28337bdedf8969ed24f05f47138840240baaeb9fded4428ae9c74' 
  AND token = 'u+Ea4X63Dj2IXdZJw5ztqXss6s57cjlEAKWpzk3PdY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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