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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1245ba3ed3f997f8204f6db53ae5d64f992f43993bea28337f5517d320ef7a8' 
  AND token = 'LuJXJge0yCpdGCl0MKd668TFV7ADp0ji2k4Rx/poX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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