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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f1b6135e6a1442266d8eafb20a855c4d79d8f748553816431d2ecfeb2171c4' 
  AND token = 'QeiHjxKwOxK46IOa0EnUtH9PxXcDx6uXhitDBZiR3zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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