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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022139bf24c52f29a066eff385537aa91d9363dbdf8a197dad3b9b832fb5161f' 
  AND token = 'klhWanOcdaQfCIkMDVvdtiwQvdX670QBS5Oopyr8dnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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