SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cc53aa8dabca6182c616333f82e924d58c8565946336ce6b03626e87578f43' 
  AND token = 'JRKaoEYz4pT9tlI0l/VPbJBhtnXUr1LT24KqwTRPeZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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