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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904262de6ff050e731233a88f7d9b82eef39fb3ae6f892dd3b88194a4a98dd12' 
  AND token = '82N5c+qzFnayLC2pYf35z74FCpRg2EAKBxBJSiXw4xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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