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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f223ee8894b98af13fa860b21894f64d2a1351770c219c563176dcf4e04cbd' 
  AND token = 'a7Wiu9h84nNzQ5lpcOJiUbIilyQzALFFHo5zB25Fsdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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