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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb768d326b2ecdc6f14f3f7eb0cbb7bfff66589a1f852e6dc8102d7b6cf698f' 
  AND token = 'vk0mDm3l9HUV7N4nIyNnuBe7ws8rvqYJdkMbHThXUgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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