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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fd488fd13731a39960fde1be8004838987b15476d0097f1c6683d07c5bbc23' 
  AND token = 'hJsmaaF9Y03sqXVMAcdWKxKWiLWOAJYx4EFqGMkGPto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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