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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c16484a15936eb7ce2696b0e3523c27efddb18c31576bf6573b0355524562f' 
  AND token = 'o/yKJtp9oSpTcd8O1zHow7KD8X8QjYeA7K6/cklif0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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