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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcecd7d8b60022e1efc56e3104be987844882565052278e2315eae58e1e9d95' 
  AND token = '7b3wwJrSoPl59/+5tfo7DiQ5PieN95v8ANZT/OkquhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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