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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796e4b8c407a8d8d5ed6e40893f2ce5caacc0f57468ceb03091198e0fb49552d' 
  AND token = 'QUILjLj8uQjnaiARAJFmOr0E40GxdGdK88n6pzzXaWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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