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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c004e1fc21fe90311e78c56d7c819c0fba44d9e38b0199f95ae35bb48b81db3' 
  AND token = '73xweNXX+tKniRBGcLosEM/U+yXCrTFmiGJSZRu7rQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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