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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e69edd0df0ed61166884c65445b41a70b958a640775ecd0fc378b9e8f215ed9' 
  AND token = 'NPy5CTLbBM1QyyRt8FnAk4TmaWVGz9x85uMi1cf47cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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