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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d86643a24a1684206b21cfc78ff6212ec3d9fc10ba54cdceb5b16bf3b5e3813' 
  AND token = 'SgysFFkqF3doEAWYcKdsZXA8SyljEOxhu9x54Q1LwEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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