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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbedcf4406a71e09905163a9e2b9aa089a8e1e438f45cfca285b3b86b8c18cb3' 
  AND token = 'B740liSWmstNik3apEwJyHR0iGPy2dycW8BmIVGTFbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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