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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6853ad937d80553e22dc81ef968d5e98047bc94fb5e2fc43e8031937385f9c' 
  AND token = 'WLbCYcCBDRn8+ddTCqGN8p2RLfRKwN1qyYQIEAwv06I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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