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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ae4b7beea46ac34a980f323e9ab62fddbfe7e4ba2b734646418541681f8d00' 
  AND token = '1BnNJtGN1tBmAjtRv4cHbiub5Be5F7CpFiEg6pU+Mac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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