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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc5946a47c2059d9bc501dbdaf829b74764e3a5e5f4b8ace5a011e0d227b9b2' 
  AND token = 'c8K8tthKuiTvgJtjVfbzZQQb7AFoekuhHs0Ljk4sfsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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