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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c72b60f70fd89c2f49dee195b0291bc3123a196e142abafc0c4ed2ec86bffaf' 
  AND token = '2b71esMDmuZGqrxGIJ4wyYfq/zpJ3nkxZ+RHJLZpPv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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