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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92416d59961448af0af0d25d5fd386e769df4821d34e59a7921adec1e5f9ad14' 
  AND token = 'AVU7ESBIdhXHkrfrpcQcuU5m+yufv9nWhC/sNvlOKoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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