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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98747722543724ea716f1e7fd0efd4fae1e9da4bcd48bcac51c74a8adeeda3d' 
  AND token = 'onrbobKl8sUQN+upCocw7tnLzNNP2gTUuajufir4jPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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