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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2592e0bfedd43f7c2e71704cee47dc5de737c3e831e91d69ac4c6e366736900d' 
  AND token = '7n+HtUXnRzLtma1nDLGsxSUKVzLtDcAIPcTa7EALV/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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