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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c71eeada74ed97887a962d9986f2ecad8b24038d10e9cc9db1de93e21b4fb' 
  AND token = 'jbxSm150LSrEjLaqEY/3Aw1z+5xotGZ6kqrw4iBI3zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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