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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbef6d9b21d12b42f019a8e6a733d000321027572e3227da036af63a128d2e02' 
  AND token = 'RhFKJBKKJ7W29W0qvVrvkXWMz05kvxBYAYfEFt6dbXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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