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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5934ac410c6c00803335fd343042539597b9d09d4406c7219ccd1dedc395b92' 
  AND token = 'tuHL3ikxEWAIuNvVTgjYi1IWG0ozvN3x7xyurn4N4C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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