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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bb420687b5d8445355bc6d95baf4d1701f38572e1381abb56464bbbc97f857' 
  AND token = 'Yh0LNOrvkF6ZAq+XSSi//A2k8KRZZ+FxIia03yGTK3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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