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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81049d0dfc950900f0fe1437853fd7b91df3b33b2086b90c33f1c6aaa1dceb96' 
  AND token = 'VnVWjgkob8GD7s6MjZ86JzdnnD8XGS2zN0lw1XOVvuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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