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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa626a9bb868618bd6a1562357c8d9753d2835ad4a2a0cf53d4a86f0d2a9c9d' 
  AND token = '5nIt5EBGpq9HqhIDisYWcdBPVF3/0NspEaXKc+7ZeHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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