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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea04217fa45972cc96ffcb0c12e4c964bc5e611a3028615baba931848f6e823' 
  AND token = 'pEjf1xRhNj8fSrAwunCswmdYNSCUPnlC4o8Z0RZSMxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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