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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411e7436bbd8e8f5ef5055a3a5e7494b07f39b7168b69d2ce27ff7e49da14e7f' 
  AND token = 'qyWslpkavZgNRg1DSnqr7JsZq0jwE5NPIYScB0nvagE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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