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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b80477511d236d3c35b851a2b90fd8f64eb7835f22176ca3efaab38f377cba9' 
  AND token = '0jeTD8/L7UtY2mCGAeFDfB2VhCI1F2P376gd5e7i+bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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