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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54113d0f026c90a4a1f1b500099e0ae497f06fe655d09422b41a57db9cfe5071' 
  AND token = 'zL+XFP8v6i4BYb5JHwNqDMm3VNUujtQUdSRXoXx7d6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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