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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70067948cd57078e574857b664246f0758884daff572639e161cd48c4718df0a' 
  AND token = 'VdQS/rMEJj+vsAnxXRShnh611R1QinDkT+U8UarjGaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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