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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276c3c52d12ced85d9a73c430c5313591e4b4bedd9ca3c748fc1fddc7bb8414d' 
  AND token = 'ZufPvZL7q/DalNkdjyICFIh1qnFkyfETnEKDg2TbzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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