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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae64498eb70c71cc82f7fbe0af747502f8e1908cf469e80cbae936a85976563' 
  AND token = 'JvhvJcn3V6TVxcDvLR6IlQuAUtaOG1ZvTZdLt7TD4u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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