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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef0114bd988a535e8fd974b8e15c23106eb3ba2c9da81d797196c5a5c0be127' 
  AND token = 'RRqR32AdXENIIhyGRfe8h9s7AxC7W1oJ3WCe4hlIw7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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