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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a24fa6e3ca40cd483305a607a995437af5c6fd253e960e4f765fd565debc8a4' 
  AND token = 'VnTdtBDpW0BWT8Ra1P60PtS71WCQa14NV/Zz7NV50S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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