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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf9c20a25a6c6be4b8616ee8823ebe8e9ef37fdd76bbde8fe36f4411dd112f8' 
  AND token = 'Md7NnMUYrvj7wuC0UMMivXGhbBCUirkUPpnbqJBo4vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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