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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0913314928e8af99f734198ce6892dca2e8cc6e47ad15558ce09267ca300ae' 
  AND token = '3ym2RYoD6hk6Cdjs9jV0e0bkg7xndJjCUF7uyA/+Be0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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