SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13257e43fcda64931ba650ed5a072294da6bc4e0e9c2158cf228b85b084551c9' 
  AND token = 'cwKP8PGuOQAr/4GCJnLqgDxlArOpR8qIcyBxgjJrTzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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