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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c346ef8343d8c22f054f02ca550f5092c4bcdad26c558025ed093d7347ad838' 
  AND token = '9dokCmvcoi0ytEFHLk7DlxpYhN7KKPu/eUNvh3tcv3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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