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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836b221b5e6bda2d2b9364ef77b5fd70c9731407b7c5e66d3993d02c5dea4cf9' 
  AND token = 'OaPrxw/Od3RET4TTX2mzXgPYNIMjBPN2psIA9+OHfKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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