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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79abad8274739d985c300c36f1016079b4fe7e46a7d87f42fbf9bb774c11f3f1' 
  AND token = '0oOZxkvCBb0BLnVg2EWZ5jRqzdO7N72upTcsfMlttrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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