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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2d02e83ae4d58ac99b24d9dc36090ce1cb949de16ec436b1ea750e9faa5a96' 
  AND token = 'ViKMN4h6SGsq4Ud57+UwkWKxftBy5LWFijBSs7m/w0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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