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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c934f7de4f732220d3c825da52a5dfca68af75c973873dd68f3d848a483dc5' 
  AND token = 'UXDtFlphzzI0TtQL5TQae943S+MLNGtG7tBMXllU6N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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