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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ba66143bc12cc515744b8006bc0eecf88da03cc87e335f2431d6eeb7b5fc45' 
  AND token = 'rSL6vRdVDJuMfZI+0IienHxQkiq89ZQcmCbmVy4whac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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