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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39db7091cc03f1e9707eca652ac31177d8173ac1b93d13b69f4325e5d997734b' 
  AND token = 'e5m1rlP9C7iSBVG1xLoCC9OdvccwmxUufXU4qHxyQYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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