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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bda17d6358cee2b9f82412914e8b521fce3de7b602b0fcec155c9fb0e296ce' 
  AND token = '6mGvIrq8F+OlloPJNmCHssPx7Nh5whpoWVTbbEmCzdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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