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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b43b9b76fa5a6816d3b2e539851abd8413d51f84bf2794c8eaf2e9d47a7ed6' 
  AND token = '+7FqxGmj2w+J89sGexhE4oCHDuWfE08qr0ZF8xbK1Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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