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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426a9c45bf3d9fa69ede3f3c9d04b7ef6867764769229df24adfb9b9da6bbb67' 
  AND token = 'fcpqzhxzEdLC2s4OTS68f9zak79oxcPo74PynGxKCXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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