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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1a9b1c7de0cd1661156840fc2d78eb4288445ee3209ae1f9767330835c6378' 
  AND token = 'k3Vvqxd6AhsYxDVaL8kvaDJKNTpP0x8y0jAS2UaGIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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