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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c679638dedb99e800d1811c68c0b0782d0bf4a85ba755510021e0dcc43f6f0dd' 
  AND token = 'QwBL5/zf64ScD6ryG9qkKTx/aKXF5W2t49nXKtmQD1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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