SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ceb01bf79075a2749b890ef5caefe69447575f0cd2c03a08368a1aa6372bcd' 
  AND token = 'XVwQtYqVAPXFmJHG+BWnvv7QLzU74B6Of3rj0puNMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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