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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504608054d099b123ad0858fc9bf23658580af3a9225e469b0119064c1464596' 
  AND token = 'ChgJCN5UbNyZ5nKq+qsK6G1OZqm87AbNbjbO+UhitTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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