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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb432eef4f16d6bd7fe7d351f023f98408d253d1a42dc4cf1237c9768d9819fb' 
  AND token = 'Div/6lNI29/bTKZAcoAf+bs9v6q2SeO/4U9O5P9ds1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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