SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a29b2721484d9c3054ea5686c59186961926d6310571b1a6a0467ae467fdcaf' 
  AND token = 'IqH5LBKA+9YCms7wZUK0gg+xtD+XXvfr3fBiog0C/0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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