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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3805fc43fb45017029290992fefdbaf881c59873b5381bddda628fc028d3793' 
  AND token = 'hSbD9oz7z1CtE+0zVWQWHTfqMkZ/1mbcuWb8eLbFdD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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