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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7080861bb6330ed01cbda0f1b609f5e06055a130aefaff22b89c37bab7de40' 
  AND token = 'p8oXzY5AfFND9azrXqo31ywnNEMlpA7yHa2GRr/4xf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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