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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2938bba2a69501e1c9cb0109c2ccb9dce6a0cfc5b06a1db716378549bd86c5' 
  AND token = 'EoHxubMQ4K0yZvVhl5fpoZk8M2ITPK0f10CWWwCpz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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