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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47633aee6b31529c4a812c24d91535a5b641a8e732fe53666e372f6f2e280e91' 
  AND token = '9VcF8N16A/Z9pAXhCb6OL5iSkkNX8wwQgxjoMhkxtzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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