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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fb6706041333c4fae389c6c884f6ae0e9ea6b9b3c2d56813c2c879a0382078' 
  AND token = '7LV3cL60i/tBM97Lzg1o+DdIompjYmeqUeRaoObWo58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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