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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7484cf423d33b0d8846b5d4640e5d219ed255e88f4061bb1dfa8d80bce34d62' 
  AND token = 'dIUJqO6z2J6YflKLCxsgAItgYcFmHsgtWnJEHU6uNIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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