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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963e919ebaffea0f53b794f635c1fe900cac8b6d89e3494547387fc420aad666' 
  AND token = '+MIh9iBZpWwkRx+33Tg7dqtH7CfzjziBtRuf3HeuW+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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