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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29802243cd726465c9bbcfd816b5079d80b29cd81a3b92e97b0d02c32c240a55' 
  AND token = '9wotli6+7WrLzDW4WzXR0m564p5lgySY2n5lk0/E0Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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