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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c4469ceb4f7c08f79a3b0a4dab5b54828e9180a2d89291e00e9bdf6cf8e98c' 
  AND token = 'cFqxvgHpHWCH6543SdpUdTTpoic8lRQnArUOoiF7bYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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