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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a870bcb3551e20d2af8844e8c7d5c61c8fa6cc728e42b964f732dc8f49ea82d8' 
  AND token = 'zWVwuc+ggBP4KuZud588tjz5UI26Fagf3oRHyZa7vcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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