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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b9c953a5406cd9dfe75b5eeb5851ae72156e26c07c6a77c8056d06110c1f62' 
  AND token = 'JNhIb0fgIExtjk1vxXob9hSJsN8zD3v6dggJyoyTbnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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