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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec1e4f2b25d7f2243cd9ec7e28d41fd5b40e60fcc9859e763e22d31750e1ae8' 
  AND token = 'LEp8BnusYa1CmGvu2NRehuh20ZYCjQ2q0VUD2VHA8NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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