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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833ec839e122c6c3e1a1563fea495108e02b944f4ace1da1b02e3d9d7c1b34fb' 
  AND token = 'Nog3END53XHRTdolmJ9AvRjKIQrQ8daUOXHrA64waBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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