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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960ad46eb46e27dc39c97adf760972293704d14a5c58e899850e7804f4750c81' 
  AND token = 'pfSfOKIWmtCNuxBu7EYPHS/N5NQHUgLnzgP8VOIf/jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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