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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3578b2edcfd90530a2b31f17f7e5f7cff61987f5205aaebe2d73c3b70a678a72' 
  AND token = 'tIe4IHMmmBhrfv3wK5latfgDWk8Hs6afJTzplu4+2Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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