SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e207863adf88d7fc5277a52aa3662913619db9b1440d47e012efd9d4c46c75b' 
  AND token = 'a2tx/1oSY2/mgfURJZO+lU9XvUrsgqrgO9UmyjpzkrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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