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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cf9bc4208797a153d963df6317c108ef1045aad3a9efabb960ea694f805edd' 
  AND token = 'YssFa+zLMXu8kCx0Ss0lwDacv/bSqmqZE43blbBkJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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