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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f6784a05c72bd96b7e6faa60be8b831967f4cd66c4b21aa5922dcc8a020326' 
  AND token = '/0OusI+ondswc49YLScTH936NILpcE7A8eN7ghIce9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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