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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cd13c95c4da130aeba0b746f8ce9809507de52b17b67301134a4da3653212d' 
  AND token = 'zsGaP6xnZsdgsklPYDvenfPCNzZI9vrLMID9K9QvqQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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