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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7441df8904ad33cf7a74333f44e15359b967c7252e05e76e3358a93dd366a4' 
  AND token = '3659QN+9PI3mAl2VCaKZ6okI0pZv5hwXSJ3XX6FwqDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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