SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b645025f3238cdac72816dffe5aab3c1b7c83c10fcc05c5d54068c7284d9b22b' 
  AND token = 'GdEp0wkwX+YIKUjurqrg5AhSWKAwdcb7Ylp4x9ZovIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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