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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a28101e7fa2db4fba18512600a8c950bfa01428d81e446962e1cf5478b81c5' 
  AND token = 'uiV7RKKnYXl3ZN7n5VqYgXZqnx3MYtMESgSPbPgBRKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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