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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f9d2d2aa784c476651954528e91f3423efaed2f874869b908efdb51da5e836' 
  AND token = 'mny0eZtBl6A1SAQGJSomvtrfU6lnqzFXcOiK2ZkXL/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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