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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9883b52729901d3ea21c1d2cf1e69da16234db7d4df2fcc4c465847fd8b8e4' 
  AND token = 'bzoJ8uAclwojZ74MurZqj7EnCRjZHf6TWE/5oNbIPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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