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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b14395ef12bd5e474936da6d6ef87cd38f694f5571b6c5283072e5d84fc7eb' 
  AND token = 'T+3WoLE4mt2Eoef36VVuKUCn7RiB34g6NhMG2DCs83w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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